Patient interface module (PIM) powered with wireless charging system and communicating with sensing device and processing system

ABSTRACT

Systems, devices, and methods for intraluminal ultrasound imaging are provided. An intraluminal ultrasound imaging system may include a patient interface module (PIM) in communication with an intraluminal device comprising an ultrasound imaging component and positioned within a body lumen of a patient. The PIM may receive ultrasound echo signals from the intraluminal device, transmit the ultrasound echo signals along a differential signal path, and digitize the ultrasound echo signals. The PIM may transmit the ultrasound wirelessly to a processing system. The PIM may be powered with a wireless charging system, such as an inductive charging system.

CROSS-REFERENCE TO PRIOR APPLICATIONS

This application is the U.S. National Phase application under 35 U.S.C.§ 371 of International Application No. PCT/EP2018/077764, filed on Oct.11, 2018, which claims the benefit of U.S. Provisional PatentApplication No. 62/574,655, filed on Oct. 19, 2017. These applicationsare hereby incorporated by reference herein.

TECHNICAL FIELD

The present disclosure relates generally to intraluminal imaging and, inparticular, to receiving and converting imaging signals with a patientinterface module (PIM). The PIM may be powered with a wireless powersystem. The PIM may be configured to communicate signals wirelessly to aprocessing system.

BACKGROUND

Intravascular ultrasound (IVUS) imaging is widely used in interventionalcardiology as a diagnostic tool for assessing a diseased vessel, such asan artery, within the human body to determine the need for treatment, toguide the intervention, and/or to assess its effectiveness. An IVUSdevice including one or more ultrasound transducers is passed into thevessel and guided to the area to be imaged. The transducers emitultrasonic energy with frequencies higher than 2 MHz to create an imageof the vessel of interest. Ultrasonic waves are partially reflected bydiscontinuities arising from tissue structures (such as the variouslayers of the vessel wall), red blood cells, and other features ofinterest. Echoes from the reflected waves are received by the transducerand passed along to an IVUS imaging system. The imaging system processesthe received ultrasound echoes to produce a cross-sectional image of thevessel where the device is placed.

IVUS catheters may include rotational devices. For a typical rotationalIVUS catheter, an ultrasound transducer element is located at the tip ofa flexible driveshaft that spins inside a plastic sheath inserted intothe vessel of interest. The transducer element is oriented such that theultrasound beam propagates into the tissue and back. The transducer thenlistens for the returning echoes reflected from various tissuestructures. The returning echoes are generally transmitted to an IVUSprocessing system along a single analog channel. These transmissions maybe prone to electrical noise and electromagnetic coupled interferencethat may degrade the quality of IVUS images associated with thetransmissions. Furthermore, existing IVUS systems typically require anexpensive and complex custom cable to transmit signals between theultrasound transducer element and the processing system. Additionally,existing IVUS systems are typically powered by large cables which reducetheir portability. Since the power requirements are high for many ofthese systems, they also require isolation components to protectpatients. Thus, needs exist for improvements in IVUS imaging systems.

SUMMARY

Systems, devices, and methods for intraluminal ultrasound imaging areprovided. An intraluminal ultrasound imaging system may include apatient interface module (PIM) in communication with an intraluminaldevice positioned within a body lumen of a patient. The PIM may receiveultrasound echo signals, transmit the ultrasound echo signals along adifferential signal path, and digitize the ultrasound echo signals. Theultrasound echo signals may be transmitted wirelessly to a processingsystem. The PIM may be powered by a wireless charging system such as aninductive charging system.

Embodiments of the present disclosure provide an intraluminal ultrasoundimaging system that may include: a patient interface module (PIM)communicatively disposed between a processing system and an intraluminalultrasound device configured to be positioned within a body lumen of apatient, the PIM comprising a transmitter, an analog to digitalconverter (ADC), a communication device, wherein the PIM is configuredto be powered by a wireless charging system, wherein the PIM isconfigured to: transmit, with the transmitter, a first signal to theintraluminal ultrasound device; receive an ultrasound echo signalassociated with the first signal from the intraluminal ultrasounddevice; digitize the ultrasound echo signal with the ADC; and transmitthe ultrasound echo signal to the processing system wirelessly via thecommunication device.

In some embodiments, the processing system is configured to generate anintraluminal ultrasound image representative of the ultrasound echosignal and to display the intraluminal ultrasound image on a displaydevice in communication with the processing system. The wirelesscharging system may include a rechargeable battery disposed within thePIM and a Qi inductive charging base. The PIM may not transmit orreceive signals when connected to the Qi inductive charging base. ThePIM may include a switch that prevents receiving or sending signals withthe PIM is connected to the Qi inductive charging base. The PIM may befurther configured to be powered by a charging cable.

In some embodiments, the PIM further comprises a controller incommunication with the transmitter, the ADC, and the communicationdevice. The controller may be a field-programmable gate array (FPGA).The intraluminal ultrasound device may include: a rotatable, flexibleelongate drive cable comprising a proximal portion and a distal portion;and an ultrasound element disposed at the distal portion of the drivecable and configured to obtain imaging data of the body lumen whilerotating. The intraluminal ultrasound device may be an intravascularultrasound (IVUS) device configured to be positioned within a bloodvessel. The ultrasound echo signal may travel on a differential signalpath to the ADC within the PIM. The differential signal path may includeone or more amplifiers and bandpass filters.

A method of intraluminal ultrasound imaging is also provided, including:powering, with a wireless charging system, a patient interface module(PIM) communicatively disposed between an intraluminal ultrasound deviceand a processing system the PIM; controlling, using a transmitter of thePIM, the intraluminal ultrasound device to transmit a first signal whilethe intraluminal device is positioned within a body lumen of a patient;receiving, with PIM, an ultrasound echo signal associated with the firstsignal from the intraluminal ultrasound device; digitizing theultrasound echo signal with an ADC in the PIM; and transmitting thedigitized ultrasound echo signal to the processing system via a wirelesscommunication device.

The method may also include displaying, with a display device incommunication with the processing system, an intraluminal ultrasoundimage representative of the ultrasound echo signal. The method mayinclude formatting, by the PIM, the ultrasound echo signal according toan image display format of the display device. The wireless chargingsystem may include a rechargeable battery disposed within the PIM and aQi inductive charging base. The method may include preventing thetransmission of signals by the PIM when the PIM is connected to the Qiinductive charging base. The method may include transmitting theultrasound echo signals along a differential signal path to the ADCwithin the PIM.

In some embodiments, the intraluminal ultrasound device includes: arotatable, flexible elongate drive cable comprising a proximal portionand a distal portion; and an ultrasound element disposed at the distalportion of the drive cable and configured to obtain imaging data of thebody lumen while rotating. The intraluminal ultrasound device may be anintravascular ultrasound (IVUS) device configured to be positionedwithin a blood vessel.

Additional aspects, features, and advantages of the present disclosurewill become apparent from the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

Illustrative embodiments of the present disclosure will be describedwith reference to the accompanying drawings, of which:

FIG. 1 is diagrammatic schematic view of an intraluminal ultrasoundimaging system according to some embodiments of the present disclosure.

FIG. 2 is diagrammatic perspective view of a patient interface module(PIM) according to some embodiments of the present disclosure.

FIG. 3 is diagrammatic perspective view of a PIM with a charging cableaccording to some embodiments of the present disclosure.

FIG. 4 is diagrammatic schematic view of a PIM transmitting signals to aprocessing system according to some embodiments of the presentdisclosure.

FIG. 5 is diagrammatic schematic view of a PIM charging on a wirelesscharger according to some embodiments of the present disclosure.

FIG. 6 is diagrammatic schematic view of a PIM charging on a wirelesscharger on a processing system according to some embodiments of thepresent disclosure.

FIG. 7 is a flow diagram of an ultrasound imaging method according toembodiments of the present disclosure.

DETAILED DESCRIPTION

For the purposes of promoting an understanding of the principles of thepresent disclosure, reference will now be made to the embodimentsillustrated in the drawings, and specific language will be used todescribe the same. It is nevertheless understood that no limitation tothe scope of the disclosure is intended. Any alterations and furthermodifications to the described devices, systems, and methods, and anyfurther application of the principles of the present disclosure arefully contemplated and included within the present disclosure as wouldnormally occur to one skilled in the art to which the disclosurerelates. For example, it is fully contemplated that the features,components, and/or steps described with respect to one embodiment may becombined with the features, components, and/or steps described withrespect to other embodiments of the present disclosure. For the sake ofbrevity, however, the numerous iterations of these combinations will notbe described separately.

FIG. 1 is a diagrammatic schematic view of an ultrasound system 100according to some embodiments of the present disclosure. The ultrasoundsystem 100 may be used to carry out intravascular ultrasound imaging ofa lumen of a patient. The system 100 may include an ultrasound device110, a patient interface module (PIM) 150, an ultrasound processingsystem 160, and/or a monitor 170. The ultrasound device 110 isstructurally arranged (e.g., sized and/or shaped) to be positionedwithin anatomy 102 of a patient. The ultrasound device 110 obtainsultrasound imaging data from within the anatomy 102. The ultrasoundprocessing system 160 can control the acquisition of ultrasound imagingand may be used to generate an image of the anatomy 102 (using theultrasound imaging data received via the PIM 150) that is displayed onthe monitor 170.

In some embodiments, the system 100 and/or the PIM 150 can includefeatures similar to those described in U.S. Patent Application No.62/574,455, titled “DIGITAL ROTATIONAL PATIENT INTERFACE MODULE,” filedOct. 19, 2017, U.S. Patent Application No. 62/574,687, titled“INTRALUMINAL DEVICE REUSE PREVENTION WITH PATIENT INTERFACE MODULE ANDASSOCIATED DEVICES, SYSTEMS, AND METHODS,” filed Oct. 19, U.S. PatentApplication No. 62/574,835, titled “INTRALUMINAL MEDICAL SYSTEM WITHOVERLOADED CONNECTORS,” filed Oct. 20, 2017, and U.S. Patent ApplicationNo. 62/574,610, titled “HANDHELD MEDICAL INTERFACE FOR INTRALUMINALDEVICE AND ASSOCIATED DEVICES, SYSTEMS, AND METHODS,” filed Oct. 19,2017, each of which is incorporated by reference in its entirety.

Generally, the ultrasound device 110 can be a catheter, a guidecatheter, or a guide wire. The ultrasound device 110 includes a flexibleelongate member 116. As used herein, “elongate member” or “flexibleelongate member” includes at least any thin, long, flexible structurestructurally arranged (e.g., sized and/or shaped) to be positionedwithin a lumen 104 of the anatomy 102. For example, a distal portion 114of the flexible elongate member 116 is positioned within the lumen 104,while a proximal portion 112 of the flexible elongate member 116 ispositioned outside of the body of the patient. The flexible elongatemember 116 can include a longitudinal axis LA. In some instances, thelongitudinal axis LA can be a central longitudinal axis of the flexibleelongate member 116. In some embodiments, the flexible elongate member116 can include one or more polymer/plastic layers formed of variousgrades of nylon, Pebax, polymer composites, polyimides, and/or Teflon.In some embodiments, the flexible elongate member 116 can include one ormore layers of braided metallic and/or polymer strands. The braidedlayer(s) can be tightly or loosely braided in any suitableconfiguration, including any suitable per in count (pic). In someembodiments, the flexible elongate member 116 can include one or moremetallic and/or polymer coils. All or a portion of the flexible elongatemember 116 may have any suitable geometric cross-sectional profile(e.g., circular, oval, rectangular, square, elliptical, etc.) ornon-geometric cross-sectional profile. For example, the flexibleelongate member 116 can have a generally cylindrical profile with acircular cross-sectional profile that defines an outer diameter of theflexible elongate member 116. For example, the outer diameter of theflexible elongate member 116 can be any suitable value for positioningwithin the anatomy 102, including between approximately 1 Fr (0.33 mm)and approximately 15 Fr (5 mm), including values such as 3.5 Fr (1.17mm), 5 Fr (1.67 mm), 7 Fr (2.33 mm), 8.2 Fr (2.73 mm), 9 Fr (3 mm),and/or other suitable values both larger and smaller.

The ultrasound device 110 may or may not include one or more lumensextending along all or a portion of the length of the flexible elongatemember 116. The lumen of the ultrasound device 110 can be structurallyarranged (e.g., sized and/or shaped) to receive and/or guide one or moreother diagnostic and/or therapeutic instruments. If the ultrasounddevice 110 includes lumen(s), the lumen(s) may be centered or offsetwith respect to the cross-sectional profile of the device 110. In theillustrated embodiment, the ultrasound device 110 is a catheter andincludes a lumen at the distal portion 114 of the flexible elongatemember 116. A guide wire 140 extends through the lumen of the ultrasounddevice 110 between an entry/exit port 142 and an exit/entry port at adistal end 118 of the flexible elongate member 116. Generally, the guidewire 140 is a thin, long, flexible structure that is structurallyarranged (e.g., sized and/or shaped) to be disposed within the lumen 104of the anatomy 102. During a diagnostic and/or therapeutic procedure, amedical professional typically first inserts the guide wire 140 into thelumen 104 of the anatomy 102 and moves the guide wire 140 to a desiredlocation within the anatomy 102, such as adjacent to an occlusion 106.The guide wire 140 facilitates introduction and positioning of one ormore other diagnostic and/or therapeutic instruments, including theultrasound device 110, at the desired location within the anatomy 102.For example, the ultrasound device 110 moves through the lumen 104 ofthe anatomy 102 along the guide wire 140. In some embodiments, the lumenof the ultrasound device 110 can extend along the entire length of theflexible elongate member 116. In the illustrated embodiment, theexit/entry port 142 is positioned proximally of components 130 of theultrasound device 110. In some embodiments, the exit/entry port 142, theexit/entry port at the distal end 118, and/or the lumen of theultrasound device 110 is positioned distally of the components 130. Insome embodiments, the ultrasound device 110 is not used with a guidewire, and the exit/entry port 142 can be omitted from the ultrasounddevice 110.

The anatomy 102 may represent any fluid-filled or surrounded structures,both natural and man-made. For example, the anatomy 102 can be withinthe body of a patient. Fluid can flow through the lumen 104 of theanatomy 102. In some instances, the ultrasound device 110 can bereferenced as an intraluminal device. The anatomy 102 can be a vessel,such as a blood vessel, in which blood flows through the lumen 104. Insome instances, the ultrasound device 110 can be referenced as anintravascular device. In various embodiments, the blood vessel is anartery or a vein of a patient's vascular system, including cardiacvasculature, peripheral vasculature, neural vasculature, renalvasculature, and/or any other suitable anatomy/lumen inside the body.The anatomy 102 can be tortuous in some instances. For example, thedevice 110 may be used to examine any number of anatomical locations andtissue types, including without limitation, organs including the liver,heart, kidneys, gall bladder, pancreas, lungs, esophagus; ducts;intestines; nervous system structures including the brain, dural sac,spinal cord and peripheral nerves; the urinary tract; as well as valveswithin the blood, chambers or other parts of the heart, and/or othersystems of the body. In addition to natural structures, the device 110may be used to examine man-made structures such as, but withoutlimitation, heart valves, stents, shunts, filters and other devices.

The occlusion 106 of the anatomy 102 is generally representative of anyblockage or other structural arrangement that results in a restrictionto the flow of fluid through the lumen 104, for example, in a mannerthat is deleterious to the health of the patient. For example, theocclusion 106 narrows the lumen 104 such that the cross-sectional areaof the lumen 104 and/or the available space for fluid to flow throughthe lumen 104 is decreased. Where the anatomy 102 is a blood vessel, theocclusion 106 may be a result of plaque buildup, including withoutlimitation plaque components such as fibrous, fibro-lipidic (fibrofatty), necrotic core, calcified (dense calcium), blood, fresh thrombus,and/or mature thrombus. In some instances, the occlusion 106 can bereferenced as thrombus, a stenosis, and/or a lesion. Generally, thecomposition of the occlusion 106 will depend on the type of anatomybeing evaluated. Healthier portions of the anatomy 102 may have auniform or symmetrical profile (e.g., a cylindrical profile with acircular cross-sectional profile). The occlusion 106 may not have auniform or symmetrical profile. Accordingly, diseased portions of theanatomy 102, with the occlusion 106, will have a non-symmetric and/orotherwise irregular profile. While the anatomy 102 is illustrated inFIG. 1 as having a single occlusion 106, it is understood that thedevices, systems, and methods described herein have similar applicationfor anatomy having multiple occlusions.

The ultrasound device 110 may include ultrasound imaging components 130disposed at the distal portion 114 of the flexible elongate member 116.The ultrasound imaging components 130 may be configured to emitultrasonic energy into the anatomy 102 while the device 110 ispositioned within the lumen 104. In some embodiments, the components 130may include various numbers and configurations. For example, some of thecomponents 130 may be configured to transmit ultrasound pulses whileother others may be configured to receive ultrasound echoes. Thecomponents 130 may be configured to emit different frequencies ofultrasonic energy into the anatomy 102 depending on the type of tissuebeing imaged and the type of imaging being used.

In some embodiments, the components 130 include ultrasoundtransducer(s). For example, the components 130 can be configured togenerate and emit ultrasound energy into the anatomy 102 in response tobeing activated by an electrical signal. In some embodiments, thecomponents 130 include a single ultrasound transducer. In someembodiments, the components 130 include an ultrasound transducer arrayincluding more than one ultrasound transducer. For example, anultrasound transducer array can include any suitable number ofindividual transducers between 2 transducers and 1000 transducers,including values such as 2 transducers, 4 transducers, 36 transducers,64 transducers, 128 transducers, 500 transducers, 812 transducers,and/or other values both larger and smaller. The ultrasound transducerarray including components 130 can be any suitable configuration, suchas phased array including a planar array, a curved array, acircumferential array, an annular array, etc. For example, theultrasound transducer array including components 130 can be aone-dimensional array or a two-dimensional array in some instances.

In some instances, the ultrasound imaging components 130 may be part ofa rotational ultrasound device as described in U.S. Patent ApplicationNo. 62/574,455, titled “DIGITAL ROTATIONAL PATIENT INTERFACE MODULE,”filed Oct. 19, 2017.

In some embodiments, the active area of the ultrasound imagingcomponents 130 can include one or more transducer materials and/or oneor more segments of ultrasound elements (e.g., one or more rows, one ormore columns, and/or one or more orientations) that can be uniformly orindependently controlled and activated. The active area of thecomponents 130 can be patterned or structured in various basic orcomplex geometries. The components 130 can be disposed in a side-lookingorientation (e.g., ultrasonic energy emitted perpendicular and/ororthogonal to the longitudinal axis LA) and/or a forward-looking lookingorientation (e.g., ultrasonic energy emitted parallel to and/or alongthe longitudinal axis LA). In some instances, the components 130 arestructurally arranged to emit and/or receive ultrasonic energy at anoblique angle relative to the longitudinal axis LA, in a proximal ordistal direction. In some embodiments, ultrasonic energy emission can beelectronically steered by selective triggering of ultrasound imagingcomponents 130 in an array.

The ultrasound transducer(s) of the components 130 can be apiezoelectric micromachined ultrasound transducer (PMUT), capacitivemicromachined ultrasonic transducer (CMUT), single crystal, leadzirconate titanate (PZT), PZT composite, other suitable transducer type,and/or combinations thereof. Depending on the transducer material, themanufacturing process for ultrasound transducer(s) can include dicing,kerfing, grinding, sputtering, wafer technologies (e.g., SMA,sacrificial layer deposition), other suitable processes, and/orcombinations thereof.

In some embodiments, the components 130 are configured to obtainultrasound imaging data associated with the anatomy 102, such as theocclusion 106. The ultrasound imaging data obtained by the ultrasoundimaging components 130 can be used by a medical professional to diagnosethe patient, including evaluating the occlusion 106 of the anatomy 102.For imaging, the components 130 can be configured to both emitultrasonic energy into the lumen 104 and/or the anatomy 102, and toreceive reflected ultrasound echoes representative of fluid and/ortissue of lumen 104 and/or the anatomy 102. As described herein,components 130 can include an ultrasound imaging element, such as anultrasound transducer and/or an ultrasound transducer array. Forexample, the components 130 generate and emit ultrasound energy into theanatomy 102 in response to transmission of an electrical signal to thecomponents 130. For imaging, the components 130 may generate andtransmit an electrical signal representative of the received reflectedultrasound echoes from the anatomy 102 (e.g., to the PIM 150 and/orprocessing system 160). Based on the IVUS imaging data obtained by theultrasound imaging components 130, the IVUS imaging system 160 assemblesa two-dimensional image of the vessel cross-section from a sequence ofseveral hundred of these ultrasound pulse/echo acquisition sequencesoccurring during a single revolution of the ultrasound imagingcomponents 130.

In various embodiments, the ultrasound imaging component 130 can obtainimaging data associated with intravascular ultrasound (IVUS) imaging,forward looking intravascular ultrasound (FL-IVUS) imaging,intravascular photoacoustic (IVPA) imaging, intracardiacechocardiography (ICE), transesophageal echocardiography (TEE), and/orother suitable imaging modalities. In some embodiments, the device 110can include an imaging component of any suitable imaging modality, suchas optical imaging, optical coherence tomography (OCT), etc. In someembodiments, the device 110 can include any suitable sensing component,including a pressure sensor, a flow sensor, a temperature sensor, anoptical fiber, a reflector, a mirror, a prism, an ablation element, aradio frequency (RF) electrode, a conductor, and/or combinationsthereof. The imaging and/or sensing components can be implemented in thedevice 110 in lieu of or in addition to the ultrasound component 130.

For diagnosis and/or imaging, the center frequency of the components 130can be between 2 MHz and 75 MHz, for example, including values such as 2MHz, 5 MHz, 10 MHz, 20 MHz, 40 MHz, 45 MHz, 60 MHz, 70 MHz, 75 MHz,and/or other suitable values both larger and smaller. For example, lowerfrequencies (e.g., between 2 MHz and 10 MHz) can advantageouslypenetrate further into the anatomy 102, such that more of the anatomy102 is visible in the ultrasound images. Higher frequencies (e.g., 50MHz, 75 MHz) can be better suited to generate more detailed ultrasoundimages of the anatomy 102 and/or fluid within the lumen 104. In someembodiments, the frequency of the ultrasound imaging components 130 istunable. For imaging, in some instances, the components 130 can be tunedto receive wavelengths associated with the center frequency and/or oneor more harmonics of the center frequency. In some instances, thefrequency of the emitted ultrasonic energy can be modified by thevoltage of the applied electrical signal and/or the application of abiasing voltage to the ultrasound imaging components 130.

In some embodiments, the ultrasound imaging components 130 arepositioned at the distal portion of the flexible elongate member 116.The ultrasound imaging components 130 can include one or more electricalconductors extending along the length from the flexible elongate member116. The electrical conductor(s) are in communication with theultrasound imaging components 130 at the distal portion 114, and aninterface 156 at the proximal portion 112. The electrical conductorscarry electrical signals between the ultrasound processing system 160and the ultrasound imaging components 130. For example, activationand/or control signals can be transmitted from the processing system 160to the ultrasound imaging components 130 via the electrical conductors.Electrical signals representative of the reflected ultrasound echoes canbe transmitted from the ultrasound imaging components 130 to theprocessing system 160 via the electrical conductors. In someembodiments, the same electrical conductors can be used forcommunication between the processing system 160 and the ultrasoundimaging components 130.

The ultrasound device 110 includes an interface 156 at the proximalportion 112 of the flexible elongate member 116. In some embodiments,the interface 156 can include a handle. For example, handle can includeone or more actuation mechanisms to control movement of the device 110,such as deflection of the distal portion 114. In some embodiments, theinterface 156 can include a telescoping mechanism that allows forpullback of the device 110 through the lumen. In some embodiments, theinterface 156 can include a rotation mechanism to rotate one or morecomponents of the device 110 (e.g., the flexible elongate member 116 andthe ultrasound imaging components 130). In some embodiments, theinterface 156 includes a user interface component (e.g., one or morebuttons, a switch, etc.) for a medical professional to selectivelyactivate the ultrasound imaging components 130. In other embodiments, auser interface component of the PIM 150, the processing system 160and/or the monitor 170 allows a medical profession to selectivelyactivate the ultrasound imaging components 130. A conduit including,e.g., electrical conductors, extends between the interface 156 and theconnector 108. The connector 108 can be configured to mechanicallyand/or electrically couple the device 110 to the PIM 150.

The ultrasound processing system 160, the PIM 150, and/or theintravascular ultrasound device 110 (e.g., the interface 156, theultrasound imaging components 130, etc.) can include one or morecontrollers. The controllers can be integrated circuits, such asapplication specific integrated circuits (ASIC), in some embodiments.The controllers can be configured to select the particular transducerelement(s) to be used for transmit and/or receive, to provide thetransmit trigger signals to activate the transmitter circuitry togenerate an electrical pulse to excite the selected transducerelement(s), and/or to accept amplified echo signals received from theselected transducer element(s) via amplifiers of controllers. MultipleASIC configurations with various numbers of master circuits and slavecircuits can be used to create a single ultrasound wave or multi-firingultrasound wave device.

In some embodiments, the PIM 150 performs preliminary processing of theultrasound echo data prior to relaying the data to the console orprocessing system 160. In examples of such embodiments, the PIM 150performs amplification, filtering, and/or aggregating of the data. In anembodiment, the PIM 150 also supplies high- and low-voltage DC power tosupport operation of the device 110 including circuitry associated withthe ultrasound transducers 130.

In some embodiments, the PIM 150 is powered by a wireless chargingsystem. The wireless charging system may include an inductive chargingsystem. For example, the PIM 150 may include a battery that is chargedwith a Qi inductive charging base. This may allow for a portable PIM150. Furthermore, an internal battery of the PIM 150 may produce lowenough current that electrical isolation components are not required. Inother embodiments, the PIM 150 includes a charging cable in addition tothe internal battery. In this case, the PIM 150 may be an isolationdevice as, in various surgical settings, patient safety requirementsmandate physical and electrical isolation of the patient from one ormore high voltage components.

The ultrasound processing system 160 receives imaging data (e.g.,electrical signals representative of the ultrasound echo data) from theultrasound imaging components 130 by way of the PIM 150. The processingsystem 160 can include processing circuit, such as processor and/ormemory. The ultrasound processing system 160 processes the data toreconstruct an image of the anatomy. The processing system 160 outputsimage data such that an image of the anatomy 102, such as across-sectional IVUS image of a vessel, is displayed on the monitor 170.The processing system 160 and/or the monitor 170 can include one or moreuser interface elements (e.g., touchscreen, keyboard, mouse, virtualbuttons on a graphical user interface, physical buttons, etc.) to allowa medical professional to control the device 110, including one or moreparameters of the ultrasound imaging components 130.

In some embodiments, imaging data is transmitted from the PIM 150 to theultrasound processing system 160 wirelessly. For example, the PIM 150may be configured to transmit imaging data with a wireless Ethernetprotocol. The PIM 150 and ultrasound processing system 160 may include awireless transmitter and receiver, such as a wireless router. In someembodiments the wireless router is included in the ultrasound processingsystem 160 and not the PIM 150. The PIM 150 may also include a functionto cease all transmissions, wired and wireless, when the PIM 150 ischarging.

FIG. 2 is a diagrammatic schematic view of a PIM 150. In someembodiments, the PIM 150 is communicatively disposed between theultrasound device 110 and the processing system 160. The PIM 150 may beused to transmit commands and signals to the ultrasound device 110, aswell as to receive, process, and transmit ultrasound echo signals fromthe ultrasound device 110. In some embodiments, these ultrasound echosignals are transmitted along a differential signal path in the PIM 150,and are digitized and formatted for Ethernet transmission to theultrasound processing system 160.

The PIM 150 may include an outer housing 304. The housing 304 may besuitable for use in a sterile environment (i.e., water resistant) andmay be sized to be suitable for use on an operating table. In someembodiments, the housing 304 includes internal sections to house variouscomponents. For example, the housing 304 may include particular housingsections to contain the power system 340, the signal chain 350, and thecontroller 310 and associated components.

The controller 310 of the PIM 150 may be configured to transmit signalsto other elements of the PIM 150 as well as to external devices, such asthe ultrasound device 110, processing system 160, and monitor 170. Insome embodiments, the controller 310 is a field-programmable gate array(FPGA). In other embodiments, the controller 310 is a central processingunit (CPU), a digital signal processor (DSP), an application-specificintegrated circuit (ASIC), another hardware device, a firmware device,or any combination thereof configured to perform the operationsdescribed herein with reference to the controller 310 as shown in FIG. 2above.

The controller 310 may be connected to a memory 318. In someembodiments, the memory is a random access memory (RAM). In otherembodiments, the memory 318 is a cache memory (e.g., a cache memory ofthe controller 310), magnetoresistive RAM (MRAM), read-only memory(ROM), programmable read-only memory (PROM), erasable programmable readonly memory (EPROM), electrically erasable programmable read only memory(EEPROM), flash memory, solid state memory device, hard disk drives,other forms of volatile and non-volatile memory, or a combination ofdifferent types of memory. In some embodiments, the memory 318 mayinclude a non-transitory computer-readable medium. The memory 318 maystore instructions. The instructions may include instructions that, whenexecuted by a processor, cause the processor to perform operationsdescribed herein with reference to the controller 310 in connection withembodiments of the present disclosure.

The controller 310 may be connected to a catheter motor 326, EEPROM 324,transmitter 322, and a time gain compensation (TGC) control 320. In someembodiments, the catheter motor 326 is configured to move the ultrasounddevice 110 within a lumen. The catheter motor 326 may include arotational component for rotating a portion of the ultrasound device110. The catheter motor 326 may also include a motor for moving theultrasound device 110 along lumens within the body of the patient.

The transmitter 322 may be any type of transmission device for sendingsignals to the ultrasound device 110. In some embodiments, thecontroller 310 is configured to control the ultrasound device 110 bysending signals through the transmitter 322. In this way, the controller310 may be configured to drive the transmission of ultrasound signals bythe ultrasound device 110. The direction of transmission and signalstrength of the ultrasound signals may be controlled by the controller310. The transmitter 322 may be connected to a transmit/receive (T/R)switch 328. In some embodiments, the T/R switch 328 may be configured tochange between transmit and receive modes. For example, the controller310 may send a signal to the ultrasound device 110 while the T/R switch328 is in transmit mode. Data (such as ultrasound echo signals) may betransmitted back from the ultrasound device 110 to the PIM 150. Thisdata may be stored by the EEPROM 324. When the ultrasound echo signalsare transmitted back from the ultrasound device 110 to the PIM 150, theT/R switch 328 may be set to receive mode to receive and direct theultrasound echo signals along the correct signal route.

The ultrasound echo signals may be received by the PIM 150 and directedalong a differential signal route. In some embodiments, the differentialsignal route may include a signal chain 350 including one or moreelements 352, 354, 356, 358, 360, 362. The differential signal route mayhelp to cancel common mode noise, and in particular “whitenoise/flicker” which can occur in existing image processing systems. Thedifferential signal route and associated signal chain 350 may result ina more noise free signal and improved image quality. The signal chain350 may provide filtering and programmable gain functions. In someembodiments, the TGC control 320 is a time varying gain that adjusts forsignal loss as the distance between the PIM 150 and the ultrasounddevice 110 increases. The gain is typically reduced for near reflectionsand gradually increased for distant reflections. The amount of gain overdistance may be controlled, for example by the controller 310 of the PIM150. In some embodiments, the TGC control may be configured to controlthe signal amplification of the received ultrasound echo signals. TheTGC control 320 may also be configured to set the receive path for theultrasound echo signals along the signal chain 350. The signal chain 350may include bandpass filters 352, 360 and amplifiers 354, 356, 358, 362.For example, the ultrasound echo signals from the ultrasound device 110may be passed in order through a first bandpass filter 352, a firstfixed amplifier 354, a variable gain amplifier 356, a first bufferamplifier 358, a second bandpass filter 360, and a second bufferamplifier 362. In some embodiments, the bandpass filters 352, 360 allowsignals between 20 and 40 MHz. In other embodiments, the bandpassfilters allow other ranges of signals, such as 10 to 50 MHz, 5 to 60MHz, and other ranges.

After the signals are passed through the signal chain 350, they may betransmitted to an analog to digital converter (ADC) 330. The ADC 330 maydigitize the ultrasound echo signals for processing by the controller310. The signals may then be prepared for transmission to the ultrasoundprocessing system 160. In some embodiments, the signals from theultrasound device 110 may be transmitted by a wireless connection to theultrasound processing system 160. For example, the signals may betransmitted by a wireless transmitter 312. The wireless transmitter 312may be any type of transmitter that is configured to send wirelesssignals. The wireless transmitter 312 may include an antennae disposedon an outer surface of the housing 304 or within the housing 304.Generally, the wireless transmitter 312 may be configured to use anycurrent or future developed wireless protocol(s). For example, thewireless transmitter may be configured for wireless protocols includingWiFi, Bluetooth, LTE, Z-wave, Zigbee, WirelessHD, WiGig, etc. In someembodiments, the wireless transmitter 312 is configured to transmitwireless Ethernet signals. In this case, the signals from the ultrasounddevice 110 (which have been digitized by the ADC 330) are transmitted toan Ethernet physical layer (PHY) 316. The Ethernet PHY may be configuredto convert the signals from the ultrasound device 110 for an Ethernetconnection. The converted signals may then be passed to a wirelesstransmitter 312 and transmitted to the ultrasound processing system 160.In some embodiments, the wireless transmitter 312 also includes a wiredEthernet connection. In this case, the wireless transmitter 312 mayinclude one or more Ethernet cables as well as associated ports.

In other embodiments, the PIM 150 may be configured to transmit datafrom the ultrasound device 110 to the ultrasound processing system 160via other protocols, such as USB (and in particular, USB 3.0). In thiscase, the PIM 150 may include a wireless USB transmitter the signalsfrom the ultrasound device 110 may be configured for use with USB.

The PIM 150 may include a pullback motor 332 which may be used to pullthe ultrasound device 110 through a lumen to collect imaging data. Thepullback motor 332 may be configured to pull the ultrasound device 110at a constant speed. The pullback motor 332 may be connected to anexternal pullback sled 334.

The PIM 150 may include a wireless power system 340. In someembodiments, this wireless power system may include an inductivecharging system. The inductive charging system may include an inductivecoupling system, such as a Qi inductive charging system. This powersystem 340 may include an inductive charging base 342, a battery 344within the PIM 150, and a power distributor 346 that is configured toprovide power to the various components of the PIM 150. In someembodiments, the inductive charging base 342 is wireless and the battery344 is rechargeable. The PIM 150 may be placed on the inductive chargingbase 342 to recharge its battery 344. Due to the separation between thePIM 150 and the inductive charging base 342, isolation components maynot be required within the PIM 150, for example, if the PIM 150 has aminimum creepage distance of 4 mm of isolation from the ultrasounddevice 110 or the inductive charging base 342. In other embodiments, theminimum creepage distance may be 2 mm, 6 mm, 8 mm, or other distances.In other embodiments, the wireless power system is a resonant inductivecoupling system, a capacitive coupling system, or a magnetodynamiccoupling system. In some embodiments, the PIM 150 is configured toreceive power from microwaves, lasers, and/or light waves.

In some embodiments, the PIM 150 is configured to stop all transmissionswhile it is connected to the charging base 342. This may help to preventhigh levels of current to be passed between the PIM 150 and othercomponents (such as the ultrasound device 110) which could cause harm toa patient. This function to stop transmissions during charging mayreduce the number of isolation components that are required within thePIM 150. In some embodiments, this function is provided by a connector348 of the PIM 150. The connector 348 may be disposed on an externalportion of the housing 304, and may be configured to stop transmissionsfrom the PIM 150 while the PIM 150 is connected to the charging base342. The connector 348 may include mechanical features such as pins,flanges, projections, extensions, or other devices to effectively couplethe PIM 150 to the inductive charging base 342 and provide a signal tothe PIM 150 that it is connected. In some embodiments, the connector 348includes a switch 349, similar to FIG. 3, that has “on” and “off” modes.The switch 349 may be connected to the controller 310 of the PIM 150.When the PIM 150 is connected to the charging base 342, the switch 349may be in the “off” mode which may prevent the PIM 150 from transmittingsignals to other devices, such as the ultrasound device 110. When thePIM 150 is disconnected from the charging base 342, the switch 349 maybe in the “on” mode, allowing transmissions from the PIM 150 to otherdevices.

In some embodiments, the PIM 150 is powered by power over Ethernet(PoE). In this case, power may be input through the transmitter 312 orthrough another Ethernet connection on the PIM 150. The power may thenbe distributed throughout the PIM 150 by the power distributor 346.

FIG. 3 is a diagrammatic schematic view of a PIM 150 that may beconnected to charging cable 370. In this case, the PIM 150 may bepowered by the charging cable 370 or the power system 340 including theinductive charging base 342. The charging cable 370 may be a Power overEthernet (PoE) device or another type of power device, such as a custompower cable. The charging cable 370 may be connected to the powerdistributor 346. An isolation device 372 may be disposed between thecharging cable 370 and the power distributor 346.

In some embodiments, power is only passed through the isolation device372 when the PIM 150 is connected to the charging cable 370. This mayallow a user to choose between using the PIM 150 in a wireless,battery-powered mode or a wired, cable-charged mode while stillprotecting the patient from high current levels. Since this embodimentincludes an isolation device 372 along the wired power input, the PIM150 may be configured to transmit and receive signals even while the PIM150 is connected to the charging cable 370.

FIG. 4 is diagrammatic schematic view 400 of a PIM 150 transmittingsignals to an ultrasound processing system 160. In some embodiments, thePIM 150 includes a wireless transmitter 404 and the ultrasoundprocessing system 160 includes a wireless receiver 406. In someembodiments, the wireless receiver 404 is connected to a wireless router402. In the example of FIG. 4, imaging data (such as ultrasound echosignals) are transmitted through a cable 408 from an ultrasound device110 positioned within a lumen of the patient to the PIM 150. Thisimaging data may be digitized and processed by the PIM 150. Thedigitized data may then be wirelessly transmitted from the PIM 150 tothe ultrasound processing system 160. In this case, the PIM 150 may bepowered by a battery such that the PIM 150 is portable. As discussedabove, the battery within the PIM 150 may be chargeable via an inductivecharging base 342. However, during the transmission and reception ofsignals, the PIM 150 may not be connected to the inductive charging base342.

FIG. 5 is diagrammatic schematic view 500 of a PIM 150 that is connectedto an inductive charging base 342. In this example, the PIM 150 may nottransmit or receive signals from other devices such as the ultrasounddevice 110 or the ultrasound processing system 160. As shown in FIG. 5,the PIM 150 is not connected to the ultrasound device 110 and is nottransmitting to the ultrasound processing system 160. In otherembodiments, when the PIM 150 is connected to the inductive chargingbase 342, wireless transmission of signals may continue while wiredtransmission is stopped. For example, while the PIM 150 is connected tothe charging base 342 the PIM 150 may transmit wireless to theultrasound processing system 160 but not transmit or receive signalsfrom the ultrasound device 110.

FIG. 6 is diagrammatic schematic view 600 of a processing system 160that includes an integrated inductive charging base 342. The PIM 150 maybe placed on this inductive charging base 342 (and connected to theprocessing system 160) to charge. The inductive charging base 342 mayinclude a device 343 that prevents the PIM 150 from being connected tothe ultrasound device 110 when connected. The device 343 may be any typeof mechanical or electrical device for preventing connection between thePIM 150 and the ultrasound device 110. For example, the device 343 mayautomatically turn a switch preventing connection (as discussed in FIG.3) or the device 343 may physically plug or otherwise disable aconnector on the PIM 150 such that the ultrasound device 110 may not beconnected to the PIM 150 when the device 343 is activated. The device343 may also electrically disable the transmission and reception ofsignals to and from the PIM 150 while the PIM 150 is connected to theinductive charging base 342.

FIG. 7 provides a flow diagram illustrating a method 700 ofintravascular ultrasound imaging. As illustrated, the method 700includes a number of enumerated steps, but embodiments of the method 700may include additional steps before, after, and in between theenumerated steps. In some embodiments, one or more of the enumeratedsteps may be omitted, performed in a different order, or performedconcurrently. The method 700 may be performed using any of the systemsand devices referred to in FIGS. 1-6.

At step 702, the method 700 may include positioning an ultrasound devicein a body lumen of a patient. The ultrasound device may be similar tothe ultrasound device 110 as shown in FIGS. 1-6. In particular, theultrasound device may be an intravascular rotational ultrasound devicewith one or more imaging ultrasound transducer elements at the distalportion of a rotating drive cable. The step 702 can include placing asheath and the imaging core/drive cable within the lumen of the anatomy.The drive cable can be disposed within the sheath of the ultrasounddevice.

At step 704, the method 700 may include providing power to a patientinterface module (PIM) with a wireless charging system, such as a powersystem 340 as shown in FIGS. 2 and 3. The PIM may be connected to theultrasound device and configured to transmit signals to and receivesignals from the ultrasound device when the PIM is not charging. In someembodiments, the wireless charging system includes an inductive chargingbase (such as a Qi inductive charging base) and a battery within thePIM. The wireless charging system may include one or more devices toprevent connection of the PIM to other devices while charging, such asthe ultrasound device.

At step 706, the method 700 may include transmitting a first ultrasoundsignal with the ultrasound device into the lumen. The first ultrasoundsignal may be transmitted with one or more ultrasound elements of theultrasound device. In some embodiments, the transmission of the firstultrasound signal may be controlled by a patient interface module (PIM)such as PIM 150 as shown in FIGS. 1-6. For example, a controller of thePIM may be used to send a signal to the ultrasound device, which may inturn be transmitted into the lumen by the one or more ultrasoundelements of the ultrasound device. Step 704 may be performed while thedrive cable of the ultrasound device and the one or more ultrasoundelements are rotating within the sheath positioned inside the lumen. Inthat regard, the method 700 can include connecting the ultrasound deviceand/or the drive cable to a movement device, such as a pullback device,that is configured to rotate and/or longitudinally translate theultrasound device. The first ultrasound signal may be reflected offanatomy (e.g., tissue, blood vessel, plaque, etc.) within the lumen inthe form of ultrasound echoes, some of which may travel back toward thefirst ultrasound element. These ultrasound echo signals may be receivedby the ultrasound device, such as with one or more transducer elements.

At step 708, an ultrasound echo signal associated with the firstultrasound signal may be transmitted to the PIM. In some embodiments,the ultrasound echo signal is received by a transmit/receive (T/R)switch, such as T/R switch 328 as shown in FIGS. 2 and 3. The ultrasoundecho signal may be processed by the PIM in preparation for its use increating ultrasound images of the lumen.

At step 710, the ultrasound echo signal may be transmitted on adifferential signal path within the PIM. In some embodiments, thedifferential signal path may help to reduce noise. The differentialsignal path may include a signal chain with one or more amplifiers andbuffers. In some embodiments, the differential signal path includes, inorder, a first bandpass filter, a first fixed amplifier, a variable gainamplifier, a first buffer amplifier, a second bandpass filter, and asecond buffer amplifier. In other embodiments, the differential signalpath includes other combinations of elements.

At step 712, the ultrasound echo signal may be digitized. In someembodiments, after passing along the differential signal path, theultrasound echo signal is transmitted to an ADC within the PIM. The ADCmay be used to digitize the ultrasound echo signal. The digitizedultrasound echo signal may then be transmitted to a controller withinthe PIM.

At step 714, the digitized ultrasound echo signal may be configured fortransmission to another device, such as an ultrasound processing system.In some embodiments, this includes transmitting the digitized ultrasoundecho signal to an Ethernet physical layer (PHY) with the controller ofthe PIM. Step 714 may also include passing the ultrasound echo signal toa wireless transmitter and configuring the digitized ultrasound echosignal for wireless transmission.

At step 716, the digitized ultrasound signal may be transmittedwirelessly to the processing system. The processing system may be theultrasound processing system 160 as shown in FIG. 1. Step 716 may becarried out by using a wireless transmitter on the PIM and a wirelessreceiver on the processing system. The wireless signals transmitted maybe wireless Ethernet signals. The processing system may be used tofurther process the digitized ultrasound echo signal to produceultrasound images of the lumen of the patient.

At step 718, an ultrasound image representative of the ultrasound echosignal may optionally be displayed on a display device. The displaydevice may be similar to the monitor 170 as shown in FIG. 1. Forexample, the image can be an IVUS image of a blood vessel.

Persons skilled in the art will recognize that the apparatus, systems,and methods described above can be modified in various ways. While inthe present disclosure it is referred primarily to intraluminalultrasound device, intraluminal ultrasound system and intraluminalultrasound imaging method, the device may be any sensing deviceconfigured to provide measurements within the body (e.g. physiologicalmeasurements such as pressure, flow velocity, electric activationsignals), a corresponding sensing system and sensing method. The sensingdevice substitutes the intraluminal ultrasound device in the system andmethod disclosed herein for those alternative embodiments. Accordingly,persons of ordinary skill in the art will appreciate that theembodiments encompassed by the present disclosure are not limited to theparticular exemplary embodiments described above. In that regard,although illustrative embodiments have been shown and described, a widerange of modification, change, and substitution is contemplated in theforegoing disclosure. It is understood that such variations may be madeto the foregoing without departing from the scope of the presentdisclosure. Accordingly, it is appropriate that the appended claims beconstrued broadly and in a manner consistent with the presentdisclosure.

The invention claimed is:
 1. A sensing system, comprising: a patientinterface module (PIM) communicatively disposed between a processingsystem and a sensing device configured to be positioned within a body ofa patient, the PIM comprising a transmitter, an analog to digitalconverter (ADC), a communication device, and a power source, wherein, inan operating mode, the power source is configured to power the PIM totransmit and receive signals associated with at least one of the sensingdevice or the processing system, wherein, in a charging mode, the powersource is configured to be recharged by a wireless charging system,wherein, in the operating mode, the PIM is configured to: transmit, withthe transmitter, a first signal to the sensing device; receive ameasurement signal associated with the first signal from the sensingdevice such that the sensing device obtains the measurement signal fromthe body of the patient and the PIM is different than the sensingdevice; digitize the measurement signal with the ADC; and transmit thedigitized measurement signal to the processing system wirelessly via thecommunication device, wherein, in the charging mode, the PIM isprevented from transmitting or receiving the signals such that thesensing device and the processing system do not operate with the PIMwhile the PIM is in the charging mode, wherein the sensing device is anintraluminal ultrasound device configured to be positioned within a bodylumen of the patient, and wherein the measurement signal is ultrasoundecho signal.
 2. The system of claim 1, wherein the processing system isconfigured to generate an intraluminal ultrasound image representativeof the ultrasound echo signal and to display the intraluminal ultrasoundimage on a display device in communication with the processing system.3. The system of claim 1, wherein the power source comprises arechargeable battery disposed within the PIM and a Qi inductive chargingbase.
 4. The system of claim 3, wherein the PIM does not transmit orreceive the signals when connected to the Qi inductive charging base. 5.The system of claim 3, wherein the PIM comprises a switch that preventsreceiving or sending the signals with the PIM when is connected to theQi inductive charging base.
 6. The system of claim 1, wherein the PIM isfurther configured to be selectively powered by a charging cable.
 7. Thesystem of claim 1, wherein the PIM further comprises a controller incommunication with the transmitter, the ADC, and the communicationdevice.
 8. The system of claim 7, wherein the controller is afield-programmable gate array (FPGA).
 9. The system of claim 1, whereinthe intraluminal ultrasound device comprises: a rotatable, flexibleelongate drive cable comprising a proximal portion and a distal portion;and an ultrasound element disposed at the distal portion of the drivecable and configured to obtain imaging data of the body lumen whilerotating.
 10. The system of claim 1, wherein the intraluminal ultrasounddevice is an intravascular ultrasound (IVUS) device configured to bepositioned within a blood vessel.
 11. The system of claim 1, wherein theultrasound echo signal travels on a differential signal path to the ADCwithin the PIM.
 12. The system of claim 11, wherein the differentialsignal path comprises one or more amplifiers and bandpass filters.
 13. Asensing method, comprising: providing a patient interface module (PIM)communicatively disposed between a sensing device and a processingsystem, wherein the PIM comprises a power source, in an operating mode:powering, using the power source, the PIM to transmit and receivesignals associated with at least one of the sensing device or theprocessing system, controlling, using a transmitter of the PIM, thesensing device by transmitting a first signal to the sensing device whenpositioned within a body of a patient; receiving, with PIM, ameasurement signal associated with the first signal from the sensingdevice such that the sensing device obtains the measurement signal fromthe body of the patient and the PIM is different than the sensingdevice; digitizing the measurement signal with an analog to digitalconverter (ADC) in the PIM; and transmitting the digitized measurementsignal to the processing system via a wireless communication device; andin a charging mode: recharging the power source using a wirelesscharging system; and preventing the PIM from transmitting or receivingthe signals such that the sensing device and the processing system donot operate with the PIM while the PIM is in the charging mode, whereinthe sensing device is an intraluminal ultrasound device configured to bepositioned within a body lumen of the patient, and wherein themeasurement signal is ultrasound echo signal.
 14. The method of claim13, further comprising displaying, with a display device incommunication with the processing system, an intraluminal ultrasoundimage representative of the ultrasound echo signal.
 15. The method ofclaim 14, further comprising formatting, by the PIM, the ultrasound echosignal according to an image display format of the display device. 16.The method of claim 13, wherein the power source comprises arechargeable battery disposed within the PIM and a Qi inductive chargingbase.
 17. The method of claim 16, further comprising preventing thetransmission of the signals by the PIM when the PIM is connected to theQi inductive charging base.
 18. The method of claim 13, furthercomprising transmitting the ultrasound echo signals signal along adifferential signal path to the ADC within the PIM.
 19. The method ofclaim 13, wherein the intraluminal ultrasound device comprises: arotatable, flexible elongate drive cable comprising a proximal portionand a distal portion; and an ultrasound element disposed at the distalportion of the drive cable and configured to obtain imaging data of thebody lumen while rotating.
 20. The method of claim 13, wherein theintraluminal ultrasound device is an intravascular ultrasound (IVUS)device configured to be positioned within a blood vessel.